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I believe that Ed came to have the same understanding of the forces of physics as the ancients, and he tested/used this superior understanding of the world to replicate their accomplishments, and verify their assertions. THEN, he picked up the Castle and moved it, in order to have verifiable, and repeatable results. Therefore, I don't think that the Coral Castle is the accomplishment, it is the evidence of it.
When I come out with my second book, you will be glad you bought the first. That's all I'm willing to say at this point.
Then, he picked up the Coral Castle and moved it, scientifically validating his research by and having tangible, and repeatable results, which is one of the major principles of having a theory accepted.